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Property and Equipment (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Property Plant and Equipments [Abstract]  
Property and equipment$ 215,495$ 148,426
Less accumulated depreciation and amortization(35,950)(24,427)
Property and equipment, net179,545123,999
Land [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment9,5048,282
Land improvements [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment1,6691,597
Buildings [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment108,39648,323
Equipment under capital leases [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment5,3104,502
Leasehold improvements [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment14,85111,407
Computer equipment [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment43,31636,742
Furniture, fixtures and equipment [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment13,04211,401
Internally Developed Software [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment6,0233,825
Other [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment1,099998
Construction in progress [Member]
  
Property Plant and Equipments [Abstract]  
Property and equipment$ 12,285$ 21,349